[OPIK-5372] [FE] Add searchable configuration selector in Agent Sandbox

[miguelgrc]

Details

Replace the plain Select dropdown in the Agent Sandbox configuration tab with a searchable dropdown using the existing LoadableSelectBox component. This enables users with many config versions (20+) to quickly find a version by typing, without excessive scrolling.

• Swapped Select/SelectContent/SelectItem for LoadableSelectBox with search input
• Reused existing shared component — no new UI primitives needed
• Configuration button shows "Configuration: {name}" with tags inline

Change checklist

• User facing
• Documentation update

Issues

• OPIK-5372

AI-WATERMARK

AI-WATERMARK: yes

• If yes:
  • Tools: Claude Code
  • Model(s): claude-opus-4-6
  • Scope: Full implementation
  • Human verification: Yes — reviewed approach, removed redundant code, verified TypeScript + lint

Testing

• npx tsc --noEmit — passes with no errors
• npx eslint src/v2/pages/AgentRunnerPage/AgentRunnerConnectedState.tsx — passes with no errors
• Scenarios: dropdown opens with search, filters configs client-side (case-insensitive), shows check on selected item, closes on selection or click outside

Documentation

N/A

[github-actions]

🔄 Test environment deployment process has started

Phase 1: Deploying base version 1.10.59-4805 (from main branch) if environment doesn't exist
Phase 2: Building new images from PR branch miguelg/OPIK-5372-add-config-selector-with-search
Phase 3: Will deploy newly built version after build completes

You can monitor the progress here.

[CometActions]

✅ Test environment is now available!

To configure additional Environment variables for your environment, run [Deploy Opik AdHoc Environment workflow] (https://github.com/comet-ml/comet-deployment/actions/workflows/deploy_opik_adhoc_env.yaml)

Access Information

• URL: https://pr-6089.dev.comet.com
• Cluster: comet-ml-development
• Namespace: pr-6089
• Version: 1.10.59-6089-merge-1771
• Application logs: View in Grafana

The deployment has completed successfully and the version has been verified.

[CometActions]

🌙 Nightly cleanup: The test environment for this PR (pr-6089) has been cleaned up to free cluster resources. PVCs are preserved — re-deploy to restore the environment.

[github-actions]

🔄 Test environment deployment process has started

Phase 1: Deploying base version 1.10.59-4805 (from main branch) if environment doesn't exist
Phase 2: Building new images from PR branch miguelg/OPIK-5372-add-config-selector-with-search
Phase 3: Will deploy newly built version after build completes

You can monitor the progress here.

[CometActions]

✅ Test environment is now available!

To configure additional Environment variables for your environment, run [Deploy Opik AdHoc Environment workflow] (https://github.com/comet-ml/comet-deployment/actions/workflows/deploy_opik_adhoc_env.yaml)

Access Information

• URL: https://pr-6089.dev.comet.com
• Cluster: comet-ml-development
• Namespace: pr-6089
• Version: 1.10.59-6089-merge-1775
• Application logs: View in Grafana

The deployment has completed successfully and the version has been verified.